SMC's CQS clean room, compact air cylinder has 4 bore sizes. Standard strokes range from 5 to 50mm. 10/11-C(D)QS series, available for clean environment, prevents particle generation in a clean room. 21/22-C(D)QS series offers the same structure as the clean series, and are for the environment in which the use of copper, fluorine and silicon are restricted. The 
bolt CQSKWB20-5D -10D -15D -20D -25D -30D -35D -40D -45D -50D D Non-rotating rod side mounting 10 10 CQSKWB25-5D -10D -15D -20D -25D -30D -35D -40D -45D -50D C' Mounting bolt D' 7 7 Note) When mounting a cylinder with through-hole, be sure to use the attached plain washer.
Clean Series: 10 (Relief Type), Magnet: D (Built-in), Bore Size: 16mm, Stroke: 20mm, Rod End Thread: Female, Auto Switch: A93--Reed, DC Volt, AC Volt, LED, Horizontal, Lead Wire or Prewired Connector: L (3m), Number: S (1 pc.)
Clean Series: 10 (Relief Type), Magnet: D (Built-in), Bore Size: 16mm, Stroke: 20mm, Rod End Thread: Female, Auto Switch: M9N--Solid State, Gen. Purpose, 3 Wire NPN, Horizontal
Clean Series: Relief Type, Magnet: Built-in, Bore Size: 16mm, Stroke: 20mm, Rod End Thread: Female, Auto Switch: A93--Reed, DC Volt, AC Volt, LED, Horizontal, Lead Wire or Prewired Connector: 3m, Number: 1 pc.